runtime error in android devices

I have created an app and it runs successfully in the emulator. When I was trying to run it in any of my devices it shows the following error:

[2011-02-12 09:57:06 - FirstImage] Android Launch!
[2011-02-12 09:57:06 - FirstImage] adb is running normally.
[2011-02-12 09:57:06 - FirstImage] Performing com.gis.image.FirstImage activity launch
[2011-02-12 09:57:23 - FirstImage] Uploading FirstImage.apk onto device 'HT96WKF01291'
[2011-02-12 09:57:32 - FirstImage] Installing FirstIma开发者_StackOverflowge.apk...
[2011-02-12 09:57:52 - FirstImage] Re-installation failed due to different application signatures.
[2011-02-12 09:57:52 - FirstImage] You must perform a full uninstall of the application. WARNING: This will remove the application data!
[2011-02-12 09:57:52 - FirstImage] Please execute 'adb uninstall com.gis.image' in a shell.
[2011-02-12 09:57:52 - FirstImage] Launch canceled!

What is the issue and how can I overcome it?

You have installed this .apk before, and it was compiled using a different signature (see here for details). To fix this you need to remove the previous installation (you have to do that only when the signature has changed - not normally).

On the device itself, go Menu->Settings->Manage Applications. Select the application which you want to Uninistall, and click on the ‘Uninstall’ button. Now try your install.

When you install the application directly from eclipse it is signed by a different certificate than the one you use when you create the application for market.

What is most likely happening is that you have the app installed with a different signature than the one you are trying to install now.

Some times this happens, when you keep on installing the app through your code then it sometimes gives such kind of error..To over come this Just Open a terminal And paste this

adb uninstall com.gis.image

This is according to your Above error log...

You Just need to Uninstall your app from the Device.. Just like it :)

Hope this Helps....